import java.io.*;
/**
* Manage the phases of a compiler for the FM (flip movie) programming language.
*/
public class Flip {
	/** 
	* Manage the phases of a compiler for the FM (flip movie) programming
	* language.
	* Command switches must precede the filepath.
	* <dl>
	* <dt>-methods, -nomethods</dt>
	* <dd>enable/disable tracing of method entry/exit</dd>
	* <dt>-symbols, -nosymbols</dt>
	* <dd>enable/disable tracing of Symbols as they are defined</dd>
	* <dt>-echo, -noecho</dt>
	* <dd>enable/disable echoing of source lines as they are read.  default -echo</dd>
	* <dt>filepath</dt>
	* <dd>pathname of the file to compile.  Must be specified.</dd>
	* </dl>
	* @param args  the String array of command switches and arguments
	* @throws IOException thrown if any IO errors occur during processing
	*/
	public static void main(String[] args) throws IOException {
		boolean methods = false;
		boolean symbols = false;
		boolean echo = true;
		String path;
		int argN = 0;
		// check for -switches
		while (argN < args.length) {
			if (args[argN].charAt(0) != '-') break;
			String tag = args[argN];
			if (tag.equals("-methods")) methods=true;
			else if (tag.equals("-nomethods")) methods=false;
			else if (tag.equals("-symbols")) symbols = true;
			else if (tag.equals("-nosymbols")) symbols = false;
			else if (tag.equals("-echo")) echo = true;
			else if (tag.equals("-noecho")) echo = false;
			else System.out.println("unrecognized switch: "+tag);
			argN++;
		}
		// check for file pathname
		if (argN == args.length) {
			System.out.println("Error: Name of file to compile must be provided.");
			return;
		} else {
			path = args[argN];
		}
		
		CompilerIO io = new CompilerIO(path,"ps");
		io.setEchoing(echo);
		io.setEchoPrefix("% ");

		SymbolTable sym = new SymbolTable(2);
		Scanner lex = new Scanner(io,sym);
		Parser p = new Parser(io,sym,lex);
		p.setShowMethods(methods);
		p.setShowSymbols(symbols);
		p.setShowCode(true);
		
		boolean result = p.parse();
		io.closeAll();
		
		if (result) {
			System.out.println("Compiled "+path+" successfully.");
		} else {
			System.out.println("Compile errors in "+path);
		}
	}
}